A cluster definition is a reusable cluster template in JSON format that can be used for creating multiple Data Hub clusters with identical cloud provider settings.
Data Hub includes a set of default cluster definitions for common data analytics and data engineering use cases, and allows you to save your own custom cluster definitions. While default cluster definitions can be used across all environments, custom cluster definitions are associated with one or more specific environments. Cluster definitions facilitate repeated cluster reuse and are therefore useful for creating automation around cluster creation.
The easiest way to create a custom cluster definition is to open the create cluster wizard, provide all the parameters, and then save the settings as a cluster definition. The option to save is available on the last page of the create cluster wizard.